CVE-2022-23091

Local memory disclosure via stale shared mapping

Published Feb 15, 2024 · Updated Feb 13, 2025

Memory disclosure in FreeBSD before 12.3-RELEASE-p6, 13.0-RELEASE-p12, or 13.1-RELEASE-p1 allows local users to read private data. In vm_fault_copy_entry(), copy-on-write handling copies a backing-object page into a shared shadow object without removing every mapping of the source page. An unprivileged process that arranges shared shadow mappings can retain a stale mapping after the source page is freed and read data later assigned to other processes or the kernel.

CVSS severity4.0
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory disclosure in FreeBSD before 12.3-RELEASE-p6, 13.0-RELEASE-p12, or 13.1-RELEASE-p1 allows local users to read private data. In vm_fault_copy_entry(), copy-on-write handling copies a backing-object page into a shared shadow object without removing every mapping of the source page. An unprivileged process that arranges shared shadow mappings can retain a stale mapping after the source page is freed and read data later assigned to other processes or the kernel.

The record

CVE
CVE-2022-23091
Published
Feb 15, 2024
Updated
Feb 13, 2025
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-401
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.3-RELEASE <p6
  2. Affected versionversion=13.0-RELEASE <p12
  3. Affected versionversion=13.1-RELEASE <p1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=12.3-RELEASE <p6; version=13.0-RELEASE <p12; version=13.1-RELEASE <p1

Published CVSS scores

4.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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